Just in case anyone else gets this problem. The "config_lang.php" file included with "cmsmadesimple_diff-mle-vs-cmsms-1.2.3" has an invlaid character so my current site build failed W3C validation.
So within "config_lang.php" you need to change
'flag'=>'',
'text'=>'Français',
TO
'flag'=>'',
'text'=>'Francais',
The ç > c - remove the cedilla twice
This will only happen if you use the {lang} tag for language selection within your template and if you have French as a choice.
